Defines the concept of absolute value in a variety of mathematical methods and difficulties. Includes special links for further investigation.

Over a dozen topics in the field of Applied Mathematics are explored here. Each link contained detailed explanations of the area in question, along with examples and sketches that both teachers and students will find helpful.

This site from MathWorld describes characteristics of cones, names of various special cones, equations for a cone and many other equations relative to a cone. [Requires Java.]

Graphs of the cosine function, both 2-dimensional and 3-dimensional. Higher level mathematics applications given, including defining the hyperbolic cosine function, the cosine function as an infinite sum and infinite product, and more.

A site that deals with inverse cosine. Article includes the definition, formulas including the Macluarin series for the inverse cosine function, and examples, as well as numerous links to related terms.

This is a math site on the inverse of sine. Includes charts, color graphs, formulas including the Maclaurin series, as well as links to math terms and subject areas used within the site.

This site is all about inverse tangents. The site includes a definition, color graphs, formulas, and many links to related terms.

A site on inverse trigonometric functions. Contains a definition, a chart showing functions and their domains, formulas, and many links.

This math site explains what it means for a number to be irrational and names various persons who have proven the irrationality of some numbers, the site also gives several numbers who are thought to be irrational yet have not been proven to be irrational.

This MathWorld site gives Euclid's definition of a line, properties of lines, common terminology, and algebraic representations of lines and their distinctive parts in a cartesian system. The site then goes into detail of different line relations.

Gives a detailed overview of hexagons, particularly of regular hexagons. Be sure to use the links for unfamiliar notation or variable representation. This site gives formulas for inner radius, circumradius, parameter, and area of a regular hexagon, and much more.

This site gives an overview of rational numbers, gives interesting facts about the rational numbers including countability and probability of a rational numbers denominator being even. The site also contains related links.

This site from MathWorld.com offers extensive information on right triangles. The site contains information on numerous characteristics of right triangles, including constructing similar inscribed triangles, altitudes, Pythagorean triplets, and much more.

MathWorld provides graphs of the sine function, both 2-dimensional and 3-dimensional. Higher level mathematical applications given, including the hyperbolic sine function, representation of the sine function as an infinite sum as well as product, the convergent infinite series for the sine function, and more.

This site explain ellipse how they are formed with the foci, and gives a nice moving demonstration of drawing an ellipse. Read further down the page to equations of ellipses in different systems, including polar. The last half of the page attends the ellipse in higher mathematics.